矿粉对路用聚氨酯胶浆拉伸性能的影响

刘子怡¹，李居铜^1*，谭继兴²，马年先²，范文成²，秦天林²，许萌¹

1.山东交通学院交通土建工程学院，山东 济南  250357；2.山东金曰交通发展集团有限公司，山东 济南  250101

摘要：为分析矿粉对聚醚型聚氨酯（polyether polyurethane, PPU）胶浆抗拉强度的影响，分别采用产地不同的两种石灰岩（L1、L2）和两种玄武岩（B1、B2）及二者复配矿粉制备PPU胶浆，通过拉伸试验分析矿粉岩性、粉胶比（矿粉与PPU胶结料的体积比，分别为0.20、0.30、0.40、0.50、0.60）及矿粉复配对PPU胶浆抗拉强度的影响规律，通过傅立叶变换红外光谱仪（Fourier transform infrared spectrometer，FTIR）研究上述规律的形成机理。结果表明：相同粉胶比下，玄武岩胶浆的整体抗拉强度显著高于石灰岩胶浆；随粉胶比的增大，玄武岩矿粉与L1石灰岩矿粉胶浆的抗拉强度均先增大后减小，L2石灰岩矿粉胶浆的抗拉强度持续减小；进行拟合分析，认为石灰岩矿粉-PPU胶浆合理粉胶比不大于0.35，玄武岩矿粉-PPU胶浆合理粉胶比为0.20~0.54；制备石灰岩、玄武岩复合矿粉-PPU胶浆，随着L1矿粉占复合矿粉体积分数增大，胶浆抗拉强度先小幅增大后小幅减小再快速减小；FTIR结果显示，玄武岩表面缔结较多羟基，能与PPU中的异氰酸酯基形成强化学键合，界面黏结强度更高；考虑实用性及经济性，可采用石灰岩矿粉部分替代玄武岩矿粉，合理替代体积分数不大于26.6%。

关键词：PPU胶浆；石灰岩；玄武岩；矿粉；抗拉强度；粉胶比

The effect of mineral powder on the tensile properties of road polyurethane gel paste

LIU Ziyi¹, LI Jutong^1*, TAN Jixing², MA Nianxian², FAN Wencheng², QIN Tianlin², XU Meng¹

1.School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China;

2. Shandong Kingyue Transportation Development Group Co., Ltd., Jinan 250101, China

Abstract: To analyze the effect of mineral powder on the tensile strength of polyether polyurethane (PPU) adhesive slurry, limestone (L1, L2), basalt (B1, B2), and blended mineral powders to prepare PPU mortars. Tensile tests are conducted to analyze the influence patterns of mineral powder lithology, powder-to-binder ratio (volume ratio of mineral powder to PPU binder, 0.20, 0.30, 0.40, 0.50, 0.60 respectively), and mineral powder blending on the tensile strength of PPU mortars. The formation mechanisms of these patterns are investigated using a Fourier transform infrared spectrometer (FTIR). Results indicate that at identicalpowder-to-binder ratios, basalt grout exhibits significantly higher overall strength than limestone grout. As the powder-to-binder ratio increases, tensile strength of both basalt powder and L1 limestone powder grouts initially rises then declines, while L2 limestone powder grout strength continuously decreases. Fitting analysis indicated that the optimal powder-to-binder ratio for limestone powder-PPU mortar is below 0.35, while for basalt powder-PPU mortar it ranges from 0.20 to 0.54. For composite limestone-basalt powder-PPU paste preparations, as the volume fraction of L1 powder in the composite powder increases, the paste tensile strength first slightly increases, then slightly decreases, before rapidly decreasing. FTIR results indicate that basalt surfaces contain abundant hydroxyl groups capable of forming strong chemical bonds with isocyanate groups in PPU, thereby generating higher interfacial bond strength. Considering practicality and economy, limestone powder can partially replace basalt powder, with a reasonable substitution volume fraction not exceeding 26.6%.

Keywords: PPU mortar; limestone; basalt; mineral powder; tensile strength; powder-to-binder ratio